Somebody didn't do much homework.

The Purse Brite (As Seen On TV) has been widely available for a while now.
http://www.purse-brite.com/

And if you want a DIY version, without the pocket organizing system, check out:
http://www.iheartswitch.com/projects/purse_light_panel_1/

Never send a dude to write a lady's blog post.

I wonder if you could make these from recycled-plastic-grocery-bag yarn. It wouldn't be terribly attractive, but they'd be durable and completely recycled. Might make good shoes to muck around in the yard with.

Alternatively, I crocheted my dad a pair of slippers from Lion Suede -- doubled -- and they are pretty sturdy. Or you could just go to the hardware store and get a length of twine. Annie Modesitt knits lace replacement lawn chair seats from twine, I don't see why one couldn't knit shoes the same way.